refactor(auth): unify messenger bot link flow across login/profile/notifications

app/pages/profile.vue

@@ -1,6 +1,7 @@
 <script setup lang="ts">
 import { useMutation, useQuery } from '@vue/apollo-composable';
 import { MeDocument, MyMessengerConnectionsDocument, RegisterSelfDocument } from '~/composables/graphql/generated';
+import { buildMessengerBotStartUrl } from '~/composables/useMessengerBotLink';
 
 const companyName = ref('');
 const inn = ref('');
@@ -45,9 +46,7 @@ function buildBotConnectUrl(baseUrl: string) {
     return '';
   }
 
-  const payload = encodeURIComponent(`login:${accountEmail}`);
-  const separator = baseUrl.includes('?') ? '&' : '?';
-  return `${baseUrl}${separator}start=${payload}`;
+  return buildMessengerBotStartUrl(baseUrl, accountEmail);
 }
 
 const telegramConnectUrl = computed(() => buildBotConnectUrl(config.public.telegramBotUrl || ''));